Product Info

LTE Standard Module Series

EG91 Hardware Design

EG91_Hardware_Design 29 / 96

Mode

this case, RF function will be invalid.

Sleep Mode

In this mode, the current consumption of the module will be reduced to the minimal level.

During this mode, the module can still receive paging message, SMS, voice call and

TCP/UDP data from the network normally.

Power Down

Mode

In this mode, the power management unit shuts down the power supply. Software is not

active. The serial interface is not accessible. Operating voltage (connected to VBAT_RF

and VBAT_BB) remains applied.

3.5. Power Saving

3.5.1. Sleep Mode

EG91 is able to reduce its current consumption to a minimum value during the sleep mode. The following

sub-chapters describe the power saving procedures of EG91 module.

3.5.1.1. UART Application

If the host communicates with the module via UART interface, the following preconditions can let the

module enter sleep mode.

⚫ Execute AT+QSCLK=1 command to enable sleep mode.

⚫ Drive DTR to high level.

The following figure shows the connection between the module and the host.

RXD

TXD

DTR

AP_READY

TXD

RXD

EINT

GPIO

Module

Host

GND

Figure 3: Sleep Mode Application via UART

Driving the host DTR to low level will wake up the module.

⚫ When EG91 has a URC to report, RI signal will wake up the host. Please refer to Chapter 3.17 for

details about RI behavior.